NELI KINGA OLAH, SORINA PETRESCU, ELEONORA MARIAN3, TUNDE JURCA, FELICIA MARC, LUCIANA DOBJANSCHI, ANA HONIGES, RITA KISS, EDWIN SEVER BECHIR, FARAH BECHIR, GABRIELA CIAVOI THE STUDY OF ANTIOXIDANT CAPACITY IN EXTRACTS FROM VEGETAL SOURCES WITH HYPOGLYCAEMIC ACTION In the dental office, diabetes mellitus is a chronic affection that many patients suffer. Apart from the treatment of all diabetic patients, they use homeopathic medicines. We consider the importance of knowing these extracted hypoglycemic plants and their way of acting by the dentist.In this study we investigated some extracts obtained from vegetal sources used by hypoglycaemic action: Juglans regia L. -nut, Morus nigra L. -black mulberry, Olea europaea L. -olive. We followed the level of antioxidant compounds and the antioxidant capacity in the alcoholic extracts. Our results indicate higher antioxidant efficiency in the extracts from young plant parts, with meristematic tissues, and also a modified phytochemical profile, compared to the extract from mature plant parts.